INPUT VAT CLAIM

INPUT VAT CLAIMED BY US FOR THE ASSESSMENT YEAR 2016-17 APPROX  2.5 LAC AND ASSESSING AUTHORITY PASSED THIS ITC IN ASSESSMENT ORDER. 2016-2017  BUT NEXT YEAR 2017-18 WE HAVE NOT FILED TRANS 1, IN THIS MATTER THE ASSESSING AUTHORITY REJECTED INPUT VAT 2.50 LAC , WHAT CAN I DO DO IN THIS MATTER, TRANS 1  NOT FILED.